<?xml version="1.0"?>
<fes:Filter
   xmlns:fes="http://www.opengis.net/fes/2.0"
   xmlns:myops="http://www.someserver.com/myops/1.0"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://www.opengis.net/fes/2.0
                     http://schemas.opengis.net/filter/2.0/filterAll.xsd
                     http://www.someserver.com/myops/1.0 ./filter23.xsd">
   <fes:And>
      <myops:PropertyExists>
         <fes:ValueReference>Person/age</fes:ValueReference>
      </myops:PropertyExists>
      <fes:PropertyIsBetween>
         <fes:ValueReference>Person/age</fes:ValueReference>
         <fes:LowerBoundary>
            <fes:Literal>18</fes:Literal>
         </fes:LowerBoundary>
         <fes:UpperBoundary>
            <fes:Literal>200</fes:Literal>
         </fes:UpperBoundary>
      </fes:PropertyIsBetween>
   </fes:And>
</fes:Filter>
